43420924021 has 2 divisors, whose sum is σ = 43420924022. Its totient is φ = 43420924020.

The previous prime is 43420923961. The next prime is 43420924069. The reversal of 43420924021 is 12042902434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35113512996 + 8307411025 = 187386^2 + 91145^2 .

It is a cyclic number.

It is not a de Polignac number, because 43420924021 - 2⁹ = 43420923509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43420924321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710462010 + 21710462011.

It is an arithmetic number, because the mean of its divisors is an integer number (21710462011).

Almost surely, 2^43420924021 is an apocalyptic number.

It is an amenable number.

43420924021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43420924021 is an equidigital number, since it uses as much as digits as its factorization.

43420924021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 43420924021 in words is "forty-three billion, four hundred twenty million, nine hundred twenty-four thousand, twenty-one".